Polishing machine



July 21, 1936. E. TURNQUIST POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 1 July 21, 1936. TURNQUIST 2,048,235

POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 2 M Mg 3 W X 3 m mg -4 July 21, 1936. E. TURNQUIST 2,043,235

POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 3 mug YIW, AS SQ gwuenl'oz dttoz M113 July 21, 1936. E. TURNQUIST POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 4 u R.) r

" llllllllllllL July 21, 1936. TURNQUIST 2,048,235

POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 5 July 21, 1936. E. TURNQUIST POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 6 $3M \ZW 2a., QEAMM A/mhw 2am dttor we I15 July 21, 1936. E. TURNQUIST 2,048,235

POLISHING MACHINE Filed May 4, 1932 9 Sheets-Sheet 8 July 21, 1936. E. TURNQUIST POLISHING MACHINE 9 Sheets-Sheet 9 Filed May 4, 1932 duoamq 8 Patented July 21, 1936 UNITED STATES PATENT OFFICE 7 POLISHING MACHINE ware Application May 4, 1932, Serial No. 809,075

53 Claims.

This invention relates to machines for polishing articles having surfaces which are curved with respect to longitudinal and transverse planes of reference, for example, automobile lamp housings having paraboloidal surfaces.

It is among the objects of the present invention to provide a machine which will support an article and cause the same to be moved with respect to an ordinary bufling wheel in a manner such that the article will be polished completely and efiectively in the shortest space of time.

The herein disclosed machine, constituting an embodiment of the present invention, comprises a work-holder for receiving an article and for rotating the same about its longitudinal axis while in contact with a rotary bufing wheel, means operating while the article is rotating about its own axis for rocking the article about an axis transverse to its axis of rotation and parallel to the axis of the bufling wheel and for causing relative linear movement between the article and the bufling wheel transverse to the axis of the bufling wheel, the rocking of the article and the relative linear movement between the article and the buffing wheel resulting in engagement of the bufling wheel periphery with consecutive portions of the curved surface of the article.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred embodiment of one form of the present invention is clearly shown.

In the drawings:

Fig. l is a perspective view of a machine embodying the present invention.

Fig. 2 is a top view of this machine.

Fig. 3 is a front elevation of the machine showing, certain parts in section, the sections being taken substantially on the lines 30-30; and 3b3b of Fig. 2.

Fig. 4 is a front elevation of the machine.

Fig. 5 is an enlarged fragmentary sectional view taken substantially along the line 5-5 of Fig. 9.

Fig. 6 is a view similar to Fig. 3 showing, however, certain parts removed so as to disclose certain mechanisms.

Fig. '7 is a view similar to Fig. 6, and showing the position of certain elements of the machine at the beginning of a polishing operation.

Fig. 8 shows such certain elements of the machine at an advanced state of the polishing operation.

Fig. 9 is a sectional view taken substantially along the line 8-9 of Fig. 2.

Fig. 10 is a sectional view taken on the line Iii-i0 of Fig. 9.

Fig. 11 is an enlarged sectional view taken on 5 the line ll--ll of Fig. 9.

Fig. 12 is a fragmentary sectional view taken substantially along the line i2--l2 of Fig. 3.

Fig. 13 is a fragmentary sectional view taken substantially on the line i3-i3 of Fig. 3.

Fig. 14 is a sectional view taken on the line 14-44 of Fig. 3.

Fig. 15 is a fragmentary elevation looking in the direction of arrow i5 in Fig. 9.

Fig. 16 is an enlarged view of the clutch shift- 15 ing mechanism disclosed in Fig. 15, and shows the clutch in engaging position.

Fig. 17 is a view similar to Fig. 16 showing the clutch disengaged, however.

Fig. 18 is a fragmentary sectional view taken substantially along the line i8--i8 of Fig. 15.

Figs. 19 and 20 are diagrammatic views illustrating the manner in which the cross-slide is moved relative to its support.

Referring to Figs. 9 and 12, a machine frame or base 20 is shown having a cylindrical portion 2i which provides a bore 22 having a groove 23 extending longitudinally throughout the said bore. A rectangularly threaded stub shaft 24 is rotatably supported within the bore 22 and terminates into a disc-like head 25 which is located in an annular recess 26 of a support 21 and secured thereto by a plurality of screws 28. The stub shaft 24 carries a key 29 which slides in the groove 23 of the base in orderto prevent rotation of the stub shaft relative to the base. A hand wheel 30,'having an interiorly threaded boss 3i, rests against the annular boss 2! of the base and is threadedly received by the stub shaft 24. Upon rotation of the handwheel 30 the stub shaft 24 is caused to move axially, thus making it possible to adjust the height of the support 21 relative to base 20.

The support 21 provides guide ways 35 and ball bearings 35 for movably supporting a slide 31 which provides guide ways for a table 38 for movement transverse of the direction of movement of the slide 31 relative to the base. As best shown in Fig. 4, the table 38 has an extension 39 rotatably supporting a threaded spindle 40, carrying a hand wheel I and threadedly received by a nut 42 secured to the slide 31 in any suitable manner such as welding, for instance. Rotation of the hand wheel effects movement of the table 38 in the guide ways of the slide 31 relative for movement transverse to the direction of movement of the slide 31 relative to the base within guide ways 46, provided by the table 38 as best shown in Fig. 9. Coverplate 48a and 49a close the chambers 45a and 45a, respectively, of the bracket 45 and are secured to the bracket by screws 50a. Thebracket 45 provides two parallel ribs 50 and H which provide bearings 52 and 53 for cylindrical stubs 54 and 55 respectively, secured to a casing 56 in any suitable manner. (See Fig. 13). This casing provides two ball bearings 51 and 58 for journalling a horizontal shaft 59 which end extending beyond the bear ing 53 is furthermore joumalled in a bushing 50 located in the bearing 50a of a housing 5I which is integral with the rib 5| as shown in Fig. 13. The casing 55 is covered by a plate 62 and secured thereto by screws 53. The casing 56 and the cover plate 52 provide annular recesses 54 and 65, respectively, wherein ball bearings 55 and 51, respectively, are located which support a partly hollow stub shaft 58 for rotation about an axis transverse of the axis of shaft 59. The stub shaft 58 has a shoulder 69 which rests against ball bearing 51. A ring 10, secured to the cover plate 52 by screws 1| retains said ball bearing in recess 65 of the cover plate, while a nut 12, threaded over the end of stub shaft 58 maintains ball bearing 55 within recess 54 of the casing. A workholder 13, resembling the interior contour of an auto lamp housing is journalled coaxially of that part of stub shaft 68 which extends beyond the cover plate 52 and is held in firm engagement with a shoulder 15 of said stub shaft by a screw 14.

Means for rotating the workholder Referring to Figs. 3, 13 and 14, an electric motor (Fig. 3) supported by the bracket 45 and secured thereto in any suitable manner. The end of shaft 59 which extends beyond the bushing 50 has a sprocket wheel 82 keyed thereto. A nut 83, received by the threaded end of shaft 59 which extends beyond said sprocket wheel maintains the same in proper position on the shaft. A chain 84 drivingly connects the sprocket wheel with the motor. A worm 85 which is keyed to shaft 59 intermediate the ball bearings 51 and 58 and held in engagement with the shoulder 85 of said shaft by a spacing collar 81, meshes with a worm gear 88, keyed to stub shaft 58 as at 89. The worm gear is held in engagement with a shoulder of stub shaft 58 by a spacing washer 9| which rests on ball bearing 55, thus preventing longitudinal movement of the worm gear relative to the stub shaft and insuring proper meshing of the worm gear with the cooperating worm at all times.

Mechanism for moving the bracket relative to the table Referring to Figs. 4, 13 and 15'to 18 inclusive, worm I00, integral with the shaft 59 is meshing with a worm gear IOI, fixed to a shaft I02 which is journaled in a bearing I03, provided by an annular boss I04 of the casing H. The end of shaft I02 which extends beyond the casing 6I is splined and receives a shiftable clutch member I05 which cooperates with a clutch member I05 fixed to a shaft I01, journaled in a bearing I08 which is provided by an annular boss I09 of the bracket 45. The free end of shaft I01 carries a bevel pinion I I0 which is in mesh with a bevel gear III, keyed to a shaft II2 as at II3, which shaft is journaled in bearings H4 and H5, provided by the partition 41a of the bracket 45 and by the coverplate 49a, respectively. Axial thrust of the bevel gear I I I is taken up by a flared portion II6 of the bearing II4 which is engaged by the hub II1 of said bevel gear. A nut II8 which is threaded over a portion of shaft II2 maintains the bevel gear in engagement with the flared portion I I8 of the bearing I I4. Referring more particularly to Figs. 6, 'I and 8, one end of a lever H9 is pivoted to the bracket 45 as at I20, the other end of said lever is connected with the extension 39 of the table 38 by a link I 2| passing through an opening I22 of the bracket 45. The lever II9 carries an antifriction roller I23, cooperating with a cam plate I24- which is keyed to the shaft II2. Clamped to the extension 39 of the table 38 bya plate I25 screwed onto said extension as at I25 is a cable I21, shown in Fig. 1, which passes through a side wall of the bracket into chamber 45a where it is guided over a pulley I28, rotatably supported by a stud I26a fixed to the bracket, then passes again through said side wall of the bracket out of chamber 45a and finally guided over another pulley I29 which is rotatably supported on the extension 39 of the table 38. A weight I 30 is attached to the free end of the cable I21 as at l3l shown in Fig. 1. The weight I30 tends to move the bracket 45 relative to the table and toward its extension 39. This tendency of the weight causes the cam plate I24 to maintain in engagement with the cam roller I23 as will appear obvious later. Upon rotation of the cam plate I24 the lever H9 is rocked about the pivot connection I32 between said lever and the link I2I which connection is in reality a floating center for the movement of the lever I I9. It follows from the foregoing that upon rocking of the lever II9, initiated by the rotation of the cam plate I24, the pivot connection I20 between said lever and the bracket 45 is caused to move, which movement expresses itself as movement of the bracket 45 relative to the table 38.

Mechanism for rocking the workholder supporting casing Referring to Figs. 6, 7, 8 and 9, the casing 56 comprises a lug I40 which is connected with a bell crank lever I4I, pivoted to the bracket 45 as at I42, by a lengthwise adjustable link I43. The bell crank lever I4I carries an anti-friction roller I44, cooperating with a cam plate I45 which is keyed to the shaft II2. It will be noticed from the drawings that the greater mass of the casing 56 and the entire mass of the workholder tends to rotate the casing clockwise as viewed in Fig. 6 about its pivot support in the bearings 52 and 53, and therefore maintains the roller I44 in engagement with the cam plate I45 at all times. In order to prevent dust and other foreign substance from entering the chamber 45a of the bracket 45 through an opening I45 which is necessary for the passage of the link I43, a plate I41 which closely embraces the link I43 is held in sliding engagement with a surface I48 of the bracket 45 by a plate I49, secured to said bracket by screws I50, thus intercepting communication of the opening I45 with the outside regardless of the bodily movement of the connectlng link I43.

Mechanism for moving the table relative to the support Referring to Fig. 3 and particularly to Fig. 9, a bevel gear I60 is shown keyed to the end of shaft II2 which extends beyond the cover 49a; a washer I8I and a screw I62 received by said shaft maintain said. bevel gear in engagement with a spacing washer I6Ia which rests against the shaft bearing II5. A second bevel gear I63 which is in mesh with bevel gear I60 isfixed to a. stub shaft I64 by a pin I65. The stub shaft I64 is journalled in an annular boss I66 of a housing I61 formed integral with the cover 49a. A collar I68, fixed to the stub shaft I64 by a set screw I69 prevents axial movement of said shaft. As best shown in Figs. 3, 9 and 12, a casing I10, integral with the s1ide 31 houses a gear I1I fixed to a hub I12 by a set screw I13, which hub in turn is journalled on a stud I14 having a threaded portion I15 which extends through said casing and receives.a nut I16 drawing shoulder I11 ofthe stud into firm engagement with the casing I10 thus rigidly securing the stud to the casing. Another gear I18 also being housed within the casing I10 and meshing with gear "I is keyed as at I80 to a stub shaft I19 which is journalled in bearing I8I and I82, provided by the casing I10. The free end of stub shaft I19 which extends beyond the casing I10 has keyed thereto as at I84 a crank arm I85 which is also pivoted as at I86 to an arm I81 of a ring plate or link I88, journalled on a cylindrical portion I89 of the support 21. A retainer ring I90, secured to said support by screws I9I maintains the ring plate l88 in proper position on the support'as shown in Fig. 12. Telescoping members I92 and I93 are drivingly connected with the stub shaft I64 through a universal joint I94 and with the stud I14, respectively, by a universal joint I95. As shown in Fig. 11, the member I92 provides a plurality of longitudinal semicircular grooves I96 in its periphery which receive a plurality 'of balls I91 also located in longitudinal semicircular interior grooves of the member I93. This driving connection between the stub shaft I64 and the stud I14 allows for movement of the bracket 45 relative to the table 38 during polishing operations and also allows for adjustment of the table 38 relative to the slide 31 as can be readily understood.

With special reference to Figs. 19 and 20 wherein reference numerals of already described elements appear on diagrammatically illustrated equivalents, it will be noticed that rotation of the gear "I results in rotation of the gear I18 and of the crank arm I85 about the axis of shaft I19. Since the pivot point I86 of the crank arm is also a point of the ring plate I88 which is iournalled on the stationary support 21 it follows that the slide 31 is bound to move relative to the support in a continuously changing path. The slide 31 is, however, guided by the support 21 for movement in one direction X only, the imaginary resulting movement R of the slide at every instance is therefore resolved into components C1 and C2. C1 constitutes the actual movement of the slide relative to the support and within the guideways thereof, while C2 expresses itself in rotation of the ringplate I88 about its Journal on the support. Gears I1I, I18 may be replaced by another set of gears of a different ratio whereby to vary the number of reciprocations of'slide 31 relative to support 21 for instance. If such a ratio change is not desired, the

latter to follow the lever 2I9 until the latch lever telescoping driving members I92 and I93 can be directly connected with stub shaft I19 in the same manner as they are shown connected with stud I14 in Fig. 9 and the meshing gears can be dispensed with as can be readily understood.

Clutch control mechanism Referring to Figs. 4, .9 and 15 to 18 inclusive, a clutch shifter rod 200 is shown engaging the shiftable clutch half I05 and being journalled on a shaft 20I which in turn is journalled in bearings 202 and 203, provided by the bracket 45. A latch plate 204 is secured to the clutch shifter rod by a screw 205 and located thereon by pins 206. A latch lever 201, pivoted to the bracket 45 as at 208 is urged into engagement with said latch plate by its own gravity and is tripped out of engagement with the latch plate by any one of a plurality of equally spaced cammed fingers 209, pressfitted into the periphery of a control disc 2I0 which is supported on the hub 2 of a gear 2I2 coaxially thereof. The gear 2I2 is journalled on a stud 2I3 which is secured to the cover plate 48a. The control disc 2I0 is secured-on the gear 2I2 by a plurality of screws 2 I 4 in order that the gear and the control disc rotate in unison. The gear 2 I2 meshes with a pinion 2I5 mounted on a reduced portion of shaft II2, which free end is journalled in a bearing 2I6, provided by the cover 48a. Fixed to the shaft 20I as at 2I1 and in close proximity to the latch plate 204 is another latch plate 2I8 which is also engaged by the latch lever 201. Keyed to the end of shaft 20I which extends beyond the bearing 202 is a lever 2 I9 which carries a weight 220. The shaft 20I carries a key HI 3 which projects into a wide groove 222 of the hub 223 of the clutch shifter rod. In order to move the clutch shifter rod from clutch disengaging position as shown in Fig. 17 into clutch engaging position, the operator will rock the weighted lever 2I9 clockwise as viewed in Fig. 15. During such clockwise movement of the lever 2I9 the key 22I will engage a side wall 224 of the groove 222 in the hub of the clutch shifter rod thus causing the 201 engages the latch plate 204 of the clutch shifter rod and the latch plate 2I8 on the shaft 20I at which time the shiftable clutch half has arrived in clutch engaged position. The latch lever 201 maintains the lever 2I9 in raised position and also maintains the clutch shifter rod in clutch engaging position against the tension of a spring 225 which is interposed between an arm 226 of the clutch shifter rod and the bottom of bracket 45. Upon tripping of the latch lever 201 by one of the cammed fingers 209 of the control disc 2I0, the clutch shifter rod will be released and moves into clutch disengaging position under the tension of spring 225. Concurrently with the clutch shifter rod the latch plate 2I8 is released which allows the weighted lever 2 I 9 to drop counterclockwise until the key 22I engages another side wall 221 of the groove 222 of the clutch shifter rod which in the meantime has come to rest in clutch disengaging position. The short period which elapses between the tripping of the latch lever 201 and the actual. disengaging of the clutch is sufilcient to move the tripping finger 209 on the control disc out of engagement with the latch lever 201 after tripping of the same.

Woflcpzece gripping device which clamp the rim of an auto lamp housing ontowear plates 233, carried by the forked lugs and drivingly connected therewith by a pin 231 which extends through an oblong recess 238 in the hollow part of said shaft. A rod 239 which slides within the hollow portion of the shaft 68 is hinged on the pin 231 and extends beyond ball bearing in the casing 56. A cup-shaped member 248 is secured to said casing in any suitable manner and provides a guide for the rod 239. A spring 24I, interposed between a shoulder 242 of the rod 239 and a hollow plug 243 through which the rod 239 extends and which is threaded into the cupshaped member'240, tends to maintain the pin 231 in the position shown in Fig. 14. From this follows that the spring 24 I-tends to shift the grippers 23I into gripping position. Pivoted to the lug I40 of the casing 56 is a lever 244 which forked ends extend to both sides of the rod 239. The

lever 244 rests on a nut 245 which is threaded over the end of rod 239 extending beyond the lever 244 and is held in adjusted position thereon by a. lock .nut 246. The free end of the forked lever 244 is connected by a chain 241 with afoot pedal 248 pivoted to a bracket 249 on the base 28. The chain is secured to the foot pedal so as to be just sufficiently slack to allow the grippers to maintain a gripping position while the workholder axis is in a vertical position as shown in Fig. 1 or 6. When the operator depresses the pedal, the chain will at once become tight and rock the lever 244 clockwise as viewed in Fig. 6 which causes the rod 239 and the gripper shifting collar 236 to move in such direction as to rock the grippers clockwise as viewed in Fig. 6 or 14, whereupon .the operator removes a lamp housing from the workholder and places a new lamp housing thereon.

: Mode ofoperation Suppose the machine is at rest, the operator steps on the pedal 248, removes a polished lamp I by releasing the grippers 230 which are yieldingly urged into lamp housing gripping position. Immediately thereafter the operator raises the weighted lever 2I9 for drivingly engaging the clutch halves I05, I86, drivingly connecting the motor 88 with the cam shaft II2 for two complete revolutions of the latter. Two complete revolutions of the cam plate I24 on the cam shaft effect movement of the bracket 45 in the guide-ways of the table 38 toward and away from a rotary buffing wheel 260 and more particularly 0 from position A indicating the resting position of the table in Figs. 6 and '7, to position B, then to position C, from there back to position B and then to position A again, at which time cam I24 completed'one revolution. During the second revolution of this cam a'repetition of the above described movement of the bracket takes place.

Cam plate I45, being also mounted on the cam shaft II2 starts to rotate concurrently with cam plate I24 and is so designed that it rocks the workholder when the bracket reaches position B after moving from the resting position A to position B. During the movement of the bracket from position B to position C, the cam plate I45 rocks the workholder clockwise in such manner that the lamp housing substantially rolls on the polishing surface of the bufiing'wheel. Fig. 8

shows the position of the lamp housing relative to the continuously rotating buffing wheel at the end of the clockwise rotation of the workholder. During the movement of the bracket from position C toposition B the cam plate I45 rocks the workholder counter-clockwise again substantially to roll the lamp housing on the bufllng wheel polishing surface until the dot and dash position of the workholder as shown in Fig. '7 is reached at which time cam plate I45 has compfeted one revolution. During the second reciprocation of the-bracket from position B to i C and back again to B the "cam plate I 45 again rocks the workholder in the same manner described in connection with thefirst reciprocation of the bracket from position B to position C and back to position B again. At the end of the second. rocking of the workholder the same reaches the dot and dash position in Fig. 7 again whereupon cam plate I45 has no further rocking 20 to the ratio 1 to 1 between the bevel gears I60, 25

I63 :and thegears I1I, I18. Rotation of the crank arm I effects movement of the slide 31 and therewith bracket 45 relative to. the support 21 in a direction transverse of the direction of movement of the bracket relative to the table 38 30 or slide '31 which is stationary with respect to the former. "The two revolutions of the crank arm effect two reciprocations of the slide 31 relative to the support 21 so that the lamp housing,

while being in engagement with the bufling wheels 3 is moved across the bufling wheel surface in order I to utilize the entire width of the same.

Since the ratio between gear 2I5 on the cam shaft and gear 2 I2 isl to 6 and because the control disc 2 I8 carries three equally spaced cammed latch tripping fingers 209, it follows that it takes two revolutions of gear 2I5 on the cam shaft to move a cammed finger 209 into latch lever tripping position. Upon tripping of the latch lever 281 the clutch shifter rod 200 is released and urged into clutch disengaging position by spring 225; concurrently with the clutch shifter rod the weighted lever 2I9 is also released and drops down into the position shown in Fig. 15, ready to be lifted again by the operator to start another polishing operation after removing the polished lamp housing from the workholder and placing another housing thereon.

It is to be understood that this invention is not limited to two complete revolutions of the cam shaftfor one polishing operation on a lamp housing, a properly designed cam and introduction of additional speed reducing elements between the motor and the cam shaft could produce the described movements of the workholder relative to the bufflng wheel in the same period of time in response to one revolution of the cam shaft.

While the form of embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other scope of the claims which follow.

What is claimed ,is .as follows:

1. A machine for polishing the curved surface of a workpiece comprising, in combination, a

65 forms might be adopted, all coming within the rotary bufling wheel; means for rotating the workpiece about the axis of the curved surface thereof; means forrocking the workpiece about an axis transverse to its axis of rotation and parallel to the bufiing wheel axis; means for effooting relative movement between the boiling wheel and the workpiece at right angles to the rocking axis of the latter; and means for effecting relative movement between the bufling wheel and the workpiece parallel to the rocking axis of the latter.

2. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bufllng wheel; means for rotating the workpiece about the axis of the curved surface thereof and simultaneously actuating means for rocking the workpiece about an'axis transverseto its axis of rotation and parallel to the axis of the bufllng wheel and causing linear relative movement between the workpiece and the bufllng wheel transversely of the axis of the latter, such rocking of the workpiece and relative linear movement between the latter and the bufilng wheel resulting in a successive engagement of the periphery of the bufhng wheel with consecutive portions of the contour of the curved workpiece surface.

3. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bumng wheel; means for rotating the workpiece about the'axis of the curved surface thereof; simultaneously actuating means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the axis of the bufllng wheel and causing linear relative movement between the workpiece and the bufling wheel transversely of the axis of the latter, such rocking of the workpiece and relative linear movement between the latter and the buffing wheel resulting in a successive engagement of the periphery of the bufllng wheel with consecutive portions of the contour of the curved workpiece surface; and means for causing relative movement between the workpiece and the bufiing wheel parallel J0 the axis of the latter.

4. A machine for polishing the curved surface of a workpiece comprising, in combination, a, rotary bufling wheel; means for rotating the workpiece about the axis of the curved surface thereof; simultaneously actuating means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the axis of the bufling wheel and causing linear relative movement between the workpiece and the bufiing wheel transversely of the axis of the latter, such rocking of the workpiece and relative linear movement between the latter and the bufling wheel resulting in a successive engagement of the periphery of the bufling wheel with consecutive portions of the contour of the curved workpiece surface; and means for moving the workpiece relative to the bumng wheel parallel to the axis of the latter.

5. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bufilng wheel; means for rotating the workpiece about the axis of the curved surface there of means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the bufling wheel axis; means for effecting relative movement between the buffing wheel and the workpiece at right angles to the rocking axis of the latter; and means for bodily moving the workpiece parallel to its rocking axis.

6. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bufliing wheel; me ns for rotating the workpiece about the axis of the curved surface thereof; means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the bufling wheel axis; means for bodily moving the workpiece at right angles to its rocking axis; and means for effecting relative movement between the boiling wheel and the workpiece parallel to the rocking axis of the latter.

1 7. A machine for polishing the curved surface 5 of a workpiece comp ing, in combination, a rotary bufling wheel; means for rotating the workpiece about the axis of the curved surface thereof; means for rocking the workpiece about an axis transverse to its axis of rotation and parallel 1 0 l to the bumng wheel axis; means for bodily mov-' 'ing and moving of the workpiece resulting in a successive engagement of the periphery of the 25 bufiing wheel with consecutive portions of the contour of the curved workpiece surface.

9. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary buffing wheel; means for rotating the workpiece about the axis of the curved surface thereof; simultaneously actuating means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the axis of the bufling wheel and for moving the workpiece transversely of the axis of the bufling wheel, such rocking and moving of the workpiece resulting in a successive engagement of the periphery of the bufing wheel with consecutive portions of the contour of the curved workpiece surface; and means for causing relative movement between the workpiece and the bufilng wheel parallel to the axis of the latter.

10. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bufiing wheel; means for rotating the workpiece about the axis of the curved surface thereof; and simultaneously actuating means for rocking the workpiece about an axis transverse to its axis of rotation and parallel to the bufflng wheel axis, for linearly moving the workpiece transversely of the bufling wheel axis and for moving the workpiece parallel to the bufling wheel, such rocking and moving of the workpiece resulting in engagement of consecutive portions of the periphery of the bufiing wheel with consecutive portions of the contour of the curved workpiece surface.

11. A polishing machine of the character described comprising, in combination, a rotary 60 bufling wheel; a machine frame; a slide supported by the machine frame for movement parallel to the axis of the bufiing wheel; a bracket supported by the slide for movement transverse to the axis of the buffing wheel; a rotatable work- 65 holder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means for rocking the workholder about its pivotal support; means for movingthe bracket; 70 and means actuated by the prime mover for moving the slide.

12. A polishing machine of the character de-- scribed comprising, in combination, a rotary bufiing wheel; a machine frame; a slide supported 75 by the machine frame for movement parallel to the axis of the bumng wheel; a bracket supported by the slide for movement transverse to the axis of the buiiing wheel; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means for rocking the workholder about its pivotal support; means actuated by the prime mover for moving the bracket relative to the slide; and means actuated by the prime mover for moving the slide relative to the machine frame.

13. In a polishing machine of the character described, the combination of a machine frame; a slide mounted on the machine frame for linear movement relative thereto; a bracket supported by the slide for movement relative thereto at right angles to the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; and means actuated by the prime mover for rotating the workholder, for rocking the workholder, for moving thev slide and for moving the-bracket.

14. A polishing machine of the character described comprising, in combinaiton, a rotary buiiing wheel; a machine frame; a slide supported by the machine frame for movement parallel to the axis of the bufling wheel; a bracket supported by the slide for movement transverse to the axis of the buiiing wheel; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means for rocking the workholder about its pivotal support; means for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the slide moving means inoperative after completion of a polishing operation.

15. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for movement in a linear direction relative thereto; a bracket supported by the slide for movement transverse to the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivotal support; means actuated by the prime mover for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the bracket moving means inoperative after completion of a polishing operation.

16. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for movement in a linear direction relative-thereto; a bracket supported by the slide for movement transverse to the direction of movement of said slide; av rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivotal support; means actuated by the prime mover for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the workholder rocking means inoperative after completion of a polishing operation.

17. In a polishing machine of the character described, the combination of a machine frame;

' by the prime mover for moving the slide; and

means for rendering the slide moving means inoperative after completion of a polishing operation.

18. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transverse to the direction of linear movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivot support; means actuated by the prime mover for moving the bracket; means for moving the slide; and means for rendering the bracket moving means and the workholder rocking meansdnoperative after completion of a polishing operation.

19. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transverse to the direction of linear movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivot support; means actuated by the prime mover for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the bracket moving means and the workholder rocking means inoperative after completion of a polishing operation.

20. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transverse to the direction of linear movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivot support; means for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the slide moving means and the workholder rocking means inoperative after completion of a polishing operation.

21. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported bythe slide for movement transverse to the direction of linear movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivot support; means actuated by the prime mover for moving the bracket;

amazes means actuatedby the prime mover for moving the slide; and means for rendering the slide moving means and the workholder rocking means inoperative after completion of a polishing operation.

22. In a polishing machine of the character described, the combination of a machine frame; a

slide supported by the machine frame for linear movement; a bracket supported by the siidefor movement transverse to the direction of linear movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drlvingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivot support; means actuated by the prime mover for moving the bracket; means actuated by the prime mover for moving the slide; and means for rendering the bracket moving means, the slide moving means and the workholder rocking means inoperative after completion of a polishing operation.

23. A polishing machine of the character described comprising, in combination, a rotary buffing wheel; a machine frame; a slide supported by the machine frame for movement parallel to the axis of the buffing wheel; a bracket supported by the slide for movement transverse to the axis of the bufling wheel; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means for rocking the workholder about its pivotal support; means actuated in responseto operation of the last said means for moving the bracket relative to the slide; and means actuated by the prime moverfor moving the slide relative to the machine frame.

24. A polishing machine of the character described comprising, in combination, a rotary buffing wheel; a machine frame; a slide supported by the machine frame for movement parallel to the axis of the bufiing wheel; a bracket'supported by the slide for movement transverse to the axis of the hunting wheel; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; means actuated by the prime mover for rocking the workholder about its pivotal support; means actuated in response to operation of the last said means for moving the bracket relative to the slide; and

means actuated by the prime mover for moving the slide relative to the machine frame.

25. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transverse to the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; a device for rocking the workholder; a device for moving the bracket; a rotatable shaft; means on the shaft for actuating all devices in timed relation with each other; and means for moving the slide relative to the frame. a

26. In a polishing machine of the character described,-the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transverse to the direction of movemeans drivingly connecting the prime mover with the workholder forrotating the same; a device for rocking the workholder; a device for moving the bracket relative to the slide; a rotatable shaft; means on the shaft for actuating all de- 5 vices in timed relationship with each other; and means actuated in timed relationship with the op eration of the devices for moving the slide relative to the frame.

27; In a polishing machine of the character described, 'the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transversely of the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover, means drivingly connecting the prime mover with the workholder for rotating the same; a device for rockingthe workholder; a device for moving the bracket; a rotatable shaft; means on the shaft 20 for actuating all devices in timed relationv with each other; means for moving the slide relative to the frame; and means for drivingly connecting the shaft with the prime mover.

28. In.a polishing machine of the character described, the combination of a machine frame;

a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transversely of the direction of movement of the slide; a rotatable workholder pivotal- 30 ly mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; a device for rocking the workholder; a device for moving the bracket; arotatable shaft; means on the shaft for actuating all devices in timed relation with each other; means for moving the slide relative to the frame; means for drivingly connecting the rotatable shaft with the prime mover; and means for automatically disconnecting the shaft from the prime mover after a completed polishing operation.

29. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transversely of the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivirmly connecting the prime mover with a workholder for rotating the same; a device for rocking the workholder; a device for moving the bracket; a rotatable shaft; means on the shaft for actuating all devices in timed relation with each other; means actuated in timed relation with the operation of the devices for moving the slide relative to the frame; means for drivingly connecting the rotatable shaft with the prime mover; and means for automatically disconnecting the shaft from the prime mover after a completed polishing operation.

30. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by theslide for movement transversely of the direction of movement of the siide; a rotatable workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime mover with the workholder for rotating the same; a device for rocking the workholder; a device for moving the bracket; a rotatable shaft carried by the bracket; means on the shaft for actuating all devices in timed relation with each other; and means for moving the slide relative to the frame.

31. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the machine frame for linear movement; a bracket supported by the slide for movement transversely of the direction of movement of the slide; a rotatable workholder pivotally mounted on the bracket: a prime mover; means drivinglyconnecting the prime mover with the workholder for rotating the same; a device for rocking the workholder; a device for moving the bracket, a rotatable shaft; cams on the shaft for actuating all devices; and means for moving the I a a slide supported by the frame for movement in a certain direction; a bracket supported by the slide for movement in another direction; a rotatable workholder pivotally mounted on the bracket; a device for moving the bracket relative to the slide; a device for rocking the workholder about its pivot axis; a rotatable shaft carried by the bracket; means on said shaft for actuating all devices; and means driven by said shaft for moving the slide relative to the frame.

34. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the frame for movement in a certain direction; a bracket supported by the slide for movement in another direction; a device for moving the bracket relative to the slide; a rotatable shaft carried bythe bracket; means on said shaft for actuating the device; means actuated in response to rotation of the shaft for moving the slide relative to the frame; a prime mover, a driving connection between the prime mover and the shaft, said driving connection including a clutch; means for actuating the clutch; and means actuated in response to a predetermined cycle of rotation of the shaft for causing the clutch actuating means to disengage the clutch.

35. In a polishing machine of the character described, the combination of a machine frame; a slide supported by the frame for movement in a certain direction; abracket supported by the slide for movement in another direction; a rotatable workholder pivotally mounted on the bracket; a device for moving the bracket relative to the slide; a device for rocking the workholder about its pivot axis; a rotatable shaft carried by the bracket; means on said shaft for actuating all devices; means actuated in response to rotation of'the shaft for moving the slide relative to the the prime mover with the workholder for rotating 5 the same; a device for rocking the workholder; a device for moving the bracket; a rotatable shaft carried by the bracket; means on the shaft for actuating all devices in timed relation with each other; means for moving the slide relative to the frame; means for drivingly connecting the prime mover with the shaft; and means for automatically disconnecting the prime mover from the shaft after completion of a polishing operation.

37. Ina polishing machine of the character described, the combination of a machine frame; a bracket supported by the frame for movement in a certain direction; a rotatable workholder pivotally mounted on. the bracket; a device for moving the bracket relative to the frame; a device for 20 rocking the workholder about its pivot axis; a rotatable shaft carried by the bracket; means on said shaft for actuating all devices; a prime mover carried by the bracket; a driving connection between the prime mover and the shaft, said driv- 25 ing connection including a normally disengaged clutch; means for shifting the clutch into engaged position; means for arresting the clutch in engaged position; and means actuated in response to a predetermined cycle of rotation of the shaft 30 for causing the clutch arresting means to release the clutch.

38. In a polishing machine of the character described, the combination of a machine frame; a bracket supported by the frame for movement in 35 a certain direction; a rotatable workholder pivotally mounted on the bracket; a device for moving the bracket relative to the frame; a device for rocking the workholder about its pivot axis; a rotatable shaft carried by the bracket; means on said shaft for actuating all devices; a prime mover carried by the bracket; a driving connection between the prime mover and the shaft, said driving connection including a normally disengaged clutch; means for shifting the clutch into engaged position; a lever pivotaliy mounted on the bracket and normally arresting the clutch in engaged position; meshing gears of a predetermined ratio rotatably carried by the bracket, one being rotatable with the shaft and another having a plurality of equiangularly spaced extending fingers, each for tripping thelever out of clutch arresting position upon engagement with the same.

39. In a polishing machine of the character described; the combination of a machine frame; a slide supported by the machine frame for movement in a certain direction; a bracket supported by the slide for movement in another direction; a rotatable shaft carried by said bracket; a rotat able workholder pivotally mounted on the bracket; a prime mover; means drivingly connecting the prime. mover with the workholder for rotating the same; means on the shaft for rocking the workholder; means for moving the bracket relative to the slide; means on the shaft for 55 actuating the last said means; means actuated by the shaft for moving the slide relative to the machine frame; means drivingly connecting the prime mover with the shaft; and means for rendering the last said means ineflective after com- 70 pletion of a polishing operation.

40. A polishing machine of the character described comprising, in combination, a rotary buifing wheel; a machine frame; a slide supported by the machine frame for movement parallel to the axis of the bufling wheel; a bracket supported by the slide for movement transverse to the axis of the bufling wheel; a prime mover carried by the bracket; a rotatable shaft carried by the bracket; means for moving the slide relative to the machine frame; means drivingly connecting the last said means with the shaft; a rotatable workholder pivotally mounted on the bracket;

' means drivingly connecting the prime mover with the workholder for rotating the same; means on the shaft for rocking the workholder about its pivotal support; means for moving the bracket toward the bufling wheel; means on the shaft for actuating the last said means; yielding means urging the bracket away from the bufflng wheel; means drivingly connecting the prime mover with the shaft; and means for rendering the last said means ineffective after a completed cycle of rotation of the shaft;

41. A polishing machine of the character described comprising, in combination, a rotary buffing wheel; a machine frame; a slide supported by the machine frame for movement in a direction parallel to the axis of the bufling wheel; a bracket supported by the slide for movement in a direction transverse to the axis of the bufling i wheel; 'a prime mover carried by the bracket; a

rotatable shaft carried by the bracket; means for moving the slide relative to the machine frame; means drivingly connecting the last said means with the shaft; a member pivotally supported on the bracket; a workholder rotatably carried by said member remote from its pivot support so that the member is rocked toward the boiling wheel by the gravity of the workholder; means for rocking the member about its pivotal support away from the bufling wheel; means on the shaft for actuating the last said means; means drivingly connecting the prime mover with the workholder for rotating the same; means for moving the bracket toward the axis of the buffing wheel; means on the shaft for actuating the last said means; yielding means urging the bracket away from the axis of the bufling wheel; means drivingly connecting the prime mover with the shaft; and means for rendering the last said means ineffective after a completed cycle of rotation of the shaft.

42. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bufling wheel; a machine frame; a slide supported by the machine frame for movement in a direction parallel to the axis of the bufflng wheel; a table supported by the slide for movement in the direction of movement of the latter; manually operable means for moving the table relative to the slide; a bracket supported by the table for movement in a direction transverse to the axis of the bufiing wheel; a prime mover carried by the bracket; a rotatable shaft carried by said bracket; means for moving the slide relative to the machine frame; means drivingly connecting the last said means with the shaft;

- a rotatable workholder pivotally supported on last said means ineflective in response to a complete cycle of rotation of the shaft.

43. A machine for polishing the curved surface of a workpiece comprising, in combination, a rotary bumng wheel; a machine frame; a slide supported by the machine frame for movement in a direction parallel to the axis of the bufling wheel; a bracket supportedbythe slide for movement in a direction transverse to the axis of the buffing wheel; a rotatable workholder pivotally supported on the bracket; a prime mover carried by the bracket; means drivingly connecting the prime mover with the workholder for rotating the same; a rotatable shaft carried by the bracket; means for rocking the workholder about its pivotal support; means on the shaft for actuating the last said means; means for moving the bracket relative to the slide; means on the shaft for actuating the last said means; a pair of meshing gears journaled on the slide; a driving connection between the shaft and one of the gears; a crank arm having one end Journaled on the slide and drivingly connected with the other gear; a link connecting the other end of the crank arm with the machine frame; means drivingly connecting the prime mover with the shaft; and means for rendering the last said means ineffective after completion of a polishing operation.

44. A machine for polishing the curved surface of, a workpiece comprising, in combination,

7 a rotary bufling wheel; a machine frame; a slide supported by the machine frame for movement in a direction parallel to the axis of the bumng wheel; a bracket supported by the slide for movement in a direction transverse to the axis of the bufling wheel; a rotary shaft carried by the bracket; means for moving the slide relative to the machine frame; means'drivingly connecting the last said means with the shaft; a rotatable workholder pivotally supported on the bracket; a prime mover carried by the bracket; means drivingly connecting the prime mover with the workholder for rotating the same; means for rocking the workholder about its pivotal support; means on the shaft for actuating the last said means; means for moving the bracket relative to the slide; means on the shaft for actuating the last said means; a clutch drivingly connecting the prime mover with the shaft; a clutch shifter rod yieldingly urged into clutch disengaging position; and means releasing the clutch shifter rod from clutch engaging position in response to a completed cycle of rotation of the shaft.

45. In a polishing machine of the character described the combination of a frame; a bracket mounted on the frame for linear movement; a crank rotatably mounted on the bracket; a link, one end of which is pivotally connected to the crank and the other end of which is pivotally mounted on the frame for rotation in a plane parallel to the plane of rotation of the crank; a rotatable shaft carried by the bracket; means transmitting rotation of the shaft to the crank; a rotatable workholder pivotally mounted on the bracket; and means on the shaft for rocking the workholder.

46. In a polishing machine of the character described the combination of a frame; a bracket mounted on the frame for linear movement; a crank carried by the bracket for rotation in a plane parallel to the plane in which the bracket moves; a link, one end of which is pivotally connected to the crank and the other end of which is pivotally mounted on the frame for rotation about an axis perpendicular to the plane in which the bracket moves; a rotatable shaft carried by the bracket; means transmitting rotation of the shaft to the crank; a rotatable workholder pivotally mounted on the bracket; and means on the shaft for rocking the workholder. .f

47. In a polishing machine of the character described, the combination of a frame; a. slide mounted on the frame for linear movement; a bracket mounted on the slide for movement transversely of the direction of movement of the slide and in a plane parallel to the plane of movement of said slide; a rotatable shaft carried by the bracket; a crank rotatably mounted on the slide; a link, one end of which is pivotally connected to the crank and the other end of which is pivotally mounted on the frame; a driving connection between the rotatable shaft and the crank, said driving connection permitting movement of the bracket relative to the slide; a rotatable workholder pivotally mounted on the bracket; and means on the shaft for rocking the workholder. I

48. In a polishing machine of the character described, the combination of a frame; a slide mounted on the frame for linear movement; a bracket mounted on the slide for movement transversely of the direction of movement of the slide and in a plane parallel to the plane of movement of said slide; a rotatable shaft carried by the bracket; a crank mounted on the slide for rotation in a plane parallel to the plane of movement of the slide relative to the frame; a link, one end of which is pivotally connected to the crank and the other end of which is pivotally mounted on the frame for rotation about an axis perpendicular to the plane of movement of the slide relative to the frame; a driving connection between the rotatable shaft and the crank, said driving connection permitting movement of the bracket relative to the slide; a rotatable workholder pivotally mounted on the bracket; and means on the shaft for rocking the workholder.

49. In a polishing machine of the character described, the combination of a frame; a slide mounted on the frame for linear movement; a bracket mounted on the slide for movement transversely of the direction of movement of the slide and in a plane parallel to the plane of movement of the slide; a rotatable shaft carried by the bracket; interchangeablemeshing gears carried for unitary rotation with the same; a driving connection between the rotatable shaft and another of the gears, said driving connection permittin'g movement of the bracket relative to the slide; a link, one end of which is pivotally connected to the crank and the other end of which workholder pivotally mounted on the bracket; and means on the shaft for rocking the workholder.

by the slide; a crank mounted on one of the gears" is pivotally mounted on the frame; a rotatable 50. In a polishing machine of the character described,- the combination of a frame; a bracket supported by the frame for linear movement; a rotatable shaft carried by the bracket; yielding means constantly urging the bracket in a certain '5 direction; a linkage connecting the 'frame with the bracket; a cam on the shaft for actuating the linkage so as to effect movement of the bracket in the opposite direction and to control movement of said bracket in said certain direc- 10 tion; a rotatable workholder pivotally mounted on the bracket; and a cam on the shaft for rocking the workholder.

51. In a polishing machine of the character described, the combination of a frame member;

one end fastened to one of the members and 5 being passed over the pulleys; a weight attached to the free end of the cable for causing the latter to keep the linkage in constant engagement with the cam; a rotatable workholder pivotally mounted on the bracket; and another cam on the shaft 0 for rocking the workholder.

52. In a polishing machine of the character described, the combination of a frame; a bracket mounted on the frame for linear movement; a

rotatable shaft carried by the bracket; a linkage connecting the frame with-the bracket; a cam on the shaft for actuating the linkage so as to cause movement of the bracket; a pulley rotatably mounted on the bracket; another pulley rotatably mounted on the frame; a cable having 4 one end fastened to the frame and being passed over the guide pulleys; a weight attached to the free end of the cable for causing the latter to keep the linkage in constant engagement with the cam; a rotatable workholder pivotally mounted on the bracket; and another cam on the shaft for rocking the workholder.

53. In a polishing machine of the character described, the combination of a frame; a bracket supported by the frame for linear movement; a rotatable shaft carried by the bracket; yielding means constantly urging the bracket in a certain direction; a linkage connecting the bracket with the frame; a cam on the shaft for actuating the 5 linkage so as to move the bracket in the opposite direction and to control movement 'of the bracket in said certain direction; a rotatable workholder pivotally mounted on the bracket;

and another cam on the shaft cooperating with 0 the workholder for rocking the same in one direction and for controlling rocking of the same in the opposite direction.

EDWARD TURNQUIST. 65 

